April 21

From Bahaikipedia

First day of the Festival of Riḍván.

• 1963: The first World Congress takes place in London.
• 1963: The first Universal House of Justice is elected by representatives of 56 National Spiritual Assemblies gathered in Haifa, in synchronization with the end of the Ten Year Crusade.
• 1990: Two Knights of Bahá’u’lláh settle on the island of Sakhalin, the last remaining territory named by Shoghi Effendi in his Ten Year Crusade.